Answer
Conversion factors between the proportions of atoms/elements within a compound are inherent in chemical formulas.
Work Step by Step
For example, in $CO_{2}$ there are two moles of oxygen atoms per mole of Carbon Dioxide molecules.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.